linux-kernel - Re: [PATCH] [13/16] HWPOISON: The high level memory error handler in the VM v3

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Date:	Tue, 2 Jun 2009 22:12:22 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Nick Piggin <npiggin@...e.de>,
	"hugh@...itas.com" <hugh@...itas.com>,
	"riel@...hat.com" <riel@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] [13/16] HWPOISON: The high level memory error handler
	in the VM v3

On Tue, Jun 02, 2009 at 10:06:39PM +0800, Andi Kleen wrote:
> > > Ok you're right. That one is not needed. I will remove it.
> > 
> > No! Please read the comment. In fact __remove_from_page_cache() has a
> > 
> >                 BUG_ON(page_mapped(page));
> > 
> > Or, at least correct that BUG_ON() line together.
> 
> Yes, but we already have them unmapped earlier and the poison check

But you commented "try_to_unmap can fail temporarily due to races."

That's self-contradictory.

> in the page fault handler should prevent remapping.
> 
> So it really should not happen and if it happened we would deserve
> the BUG.
> 
> -Andi
> 
> -- 
> ak@...ux.intel.com -- Speaking for myself only.
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